\begin{myenv}
	\part{main title}

		part body

		\chapter{\emph{emphasise}title text}

		 body text body text

		 \section{section text}

		  section body

		 \section{section text}

		  section body

		  \subsection{sub title}

			  subsection body subsection body

			  \subsubsection{subsub section title}

				  subsubsubsubsubsubsub

		\chapter{second chapter}

		 chapter body chapter body

	\part{another part}

		more parts!

		\chapter{more chapter! :)}

		 some mathematics:

		 \[

			 x^2

		 \]

		 \subsection{and some section}

			 to wrap things up
\end{myenv}
